Equipment information
Bird Electronic Corporation 3128 Other
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Model:
3128
Date:
1994
Category:
Group:
Description:
RF Monitor/Alarm
Information
PURPOSE AND FUNCTION
The Bird WATTCHER® RF monitor is a continuous service
equipment designed for the protection and performance
observation of radio frequency transmission systems. The
Control and Alarm System operates with high reliability
electromechanical components working on simple dc and low
voltage ac circuits without the use of vacuum tubes or high
impedance balanced circuitry. It is designed for use on RF
power levels from 1 Watt to 250 kilowatt, and a frequency
range from 0.45 to 2400 MHz. In use, a two-element THRULINE®
line section will be required. The THRU LI NE® RF line
section will depend upon the type of coaxial transmission
line being used in the system. Two plug-in elements are
selected to cover the power levels and frequency ranges used.
The function of the element is to detect (sense) the forward
or reflected RF power in the line section at any give time.
The direction in which the "arrow", on the Element cap, is
oriented indicates the direction in which it is sensing the
RF power flow in the system. The dc outputs of these
detectors are fed respectively to the two panel meters,
which indicate directly the forward and the reverse RF
energies (incident or reflected power). The reflected power
meter has a relay contact incorporated into it, and if the
set level is reached, visual and audible alarms will
function; and when so wired, external warning devices and
Transmitter disabling controls can be activated. The monitor
is provided with a selector that can be set for operation in
one of the two modes as described below.
1.2 MODEL DIFFERENCES
The Model 3126 RF Power Monitor/Alarm is identical to the
Model 3127 except the Model 3126 has a forward meter with a
15/30/60 kilowatt scale (P/N 2150-090). The reflected meter
has a 1.5/3.0/6.0 kilowatt scale (P/N 2150-091).
Manual Type:
Service and User Manual
Pages:
21
Size:
2.87 Mbytes (3005415 Bytes)
Language:
english
Revision:
Manual-ID:
920-3126/27/28
Date:
1994 01 01
Quality:
Scanned document, all readable.
Upload date:
2017 08 27
MD5:
0b0ac279c88c9c4e53c13d7402fc472f
Downloads:
1181
Information
Safety
Precautions ... s
i INTRODUCTION
1.1 Purpose and Function
... 1-1
1.2 Model Differences
... 1-1
1.3 Performance Characteristics ... . . .
... ... 1-1
1.4 Unit Specifications .
... 1-2
II INSTALLATION
2.1 Mounting
... 2-1
2.2 Connections
... 2-1
2.3 Selector Switch
... 2-1
2.4 Adjustments
... 2-1
III THEORY OF OPERATION
3.1 General
... 3-1
IV OPERATING INSTRUCTIONS
4.1 Preparation
... 4-1
4.2 Alarm Action
... 4-1
4.3 Performance Check
... 4-1
V MAINTENANCE
5.1 General
... 5-1
5.2 Cleaning
... 5-1
5.3 Pilot Indicator Circuit
... 5-1
5.4 Chassis Access
... 5-1
5.5 DC Control Circuitry
... 5-1
5.6 Microammeters
... 5-2
VI REPLACEMENT PARTS LIST